console.log(/\nfo\n[\n]o\bbb/);
console.log(/\n/);
console.log(/\n/);
console.log(/\n/);
console.log(/\\n/);
console.log(/\\\n/);
console.log(/\\\n/);
console.log(/\\\n/);
console.log(/\r/);
console.log(/\u2028/);
console.log(/\u2029/);
console.log(/\n\r\u2028\u2029/);
